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Can someone help me to understand the following SQL code with JOIN and LEFT JOIN? (Really new to SQL
| Author | Votes | Δ |
|---|---|---|
| Gordon Linoff | 4 | +0.82 |
| Renato | 2 | +1.30 |
| jean | 1 | -0.67 |
| Pan | 1 | -2.51 |
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